Manufacture of cast-steel chain



A. T. DEXTER.

MANUFACTURE OF CAST STEEL CHAIN.

APPLICATWN FILED JUNE 7. I919- L 3 r w z m In y m 0mm w 4 6 I r I n I. e g/W? d3 7 r m 1/ P mm! 7 Z A V w y I 3 m 1 F/ 2 F N l m/ $1 7 N Na W $5 .m. I

Patented J81]. 18, 1921.

s SHEETS-SHEET 2 APPLICAT ON FILED JUNE 7. I919.

A. T. DEXTER.

MANUFACTURE OF CAST STEEL CHAIN.

APPLICAT ON FILED JUNE 7. 1919.

1,365,771. Patented Jan. 1921.

3 SHEETSS E T 3.

Inventor By 1442 Attorney 1 UNITED, STATES PATENT OFFICE.

ALLEN T. DEXTER, OF CLEVELAND, OHIO, ASSIGNOR TO THE NATIONAL IALLE ABLE CASTINGS COMPANY, OF CLEVELAND, OHIO.

IANUFACTURE OI CAST-STEEL CHAIN.

A Application filed Jane 7,

To all whom it may concern:

Be it known that I, ALLEN T. DEXTER, a citizen of the United States residing at Cleveland, Cuyahoga county, hio, have invented new and useful Improvements in Apparatus for the Manufacture of Cast- Steel Chain, of which the followin is a specification, reference being had to t e accompanying drawings, in which- Figure 1 is a plan of a mold box embodying'my invention; Fi 2 is an elevation on' lines 11-11 of Fi 1, partly in section; Fig. 3 is an elevation thereof with the pattern pieces in operative position; Fig. 4 is an elevation similar to Fig. 3 but with the pattern pieces withdrawn from the box; Fig. 5 is a sectional detail of a pair of complementary pattern pieces; Figs. 6, 7 and 8 are details of the mechanism for locking the complementary pattern pieces together; and Fig. 9 is a perspective of a mold section produced by my improved mold box.

My invention relates to the making of cast steel chain links in the form of a continuous chain and consists in apparatus for making simultaneously a plurality of sand mold sections for casting of chain links therein. My invention also consists in the construction and arrangement of arts which I shall hereinafter describe and c aim.

Referring to the drawings, the core box consists of four compartments or single core boxes arranged side by side. Each compartment comprises sides 2, ends 3 and bottom 4. Secured to the bottom 4 of each compartment is a pattern piece 5 in the form of a half link on a longitudinal line of division and having portions of its sides cut away at 6. These pattern pieces 5 form the impressions A in which are intended to be placed precast links, and as it is not necessary that these precast links be entirely inclosed within the mold each mold section is made narrower than the width of a link to save, sand and space. Mounted within each end of each of the compartments is a curved end draw piece 7, which is removable through Also in each the end of the compartment. compartment are two curved bottomdraw pieces 8, each of which is complementary to an end. draw piece 7, and forms with the piece 7 a quarter link impression. Each bottom draw piece 8 extends through the Specification of Letters Patent.

Patented Jan. 18, 1921.

1819. Serial No. 802,588.

bottom of the box and is pivoted at the center of its curvature on a trunnion 9. In order to save time in withdrawing the pieces 7, there being a set of ieces 7 at each end of the compartments, t e pieces each set are connected to a common drawhead 10, of which there are two, one for each set. Each drawhead 10 is equipped with handles 11 by which it is operated. Secured to the end of the drawhead 10 and lying close to the sides of the box are the curved slotted guides 12, the slot being curved about the same center as the curve of the draw piece 7. Each trunnion 9, of which there are two, has pivoted to it all of the bottom draw pieces 8 at that end of the box, so that when a trunnion 9 is rotated all of the pieces 8 connected to it are simultaneously withdrawn through the bottom of the box. Secured to each end of each trunnion 9 and llyking outside of the box are the levers 13. means of links 14 to the slotted guide 12, so that when the drawheads 10 are pulled away from the box the end draw pieces 7 are withdrawn through the ends of the box and the bottom draw pieces 8 are rotated about the trunnions 9 and withdrawn through the ese levers 13 are connected by bottom of the box. Attached to the box and seated in the curved slot of each guide 12 is a pair of studs 15 which cause it to operate in an arc parallel to the are of the end drawpieces 7, and one of which acts as a limitin stop for the guide.

lhe guides 12 and drawheads 10 accordingly have a movement similar to that which would be obtained if these parts were simithis piece 16 is a pattern piece 17 which iormsapart impression for a gate in the sand through which the metal is subsequently poured into the mold. At the opposite end of each compartment is a. pattern piece 18, which on its inner face corresponds to the pattern piece 17. The draft piece 16 and the pattern pieces 17 and 18 are apertured to permit the removal of the draw pieces 7 and 8 therethrough.

The operation of molding is as follows: With the box as shown in Figs. land 2, sand is rammed into the various compartments and in and around the various pattern pieces 5, 7 and 8, and is jolted down. A core plate (not shown) is clamped over the top of the box and the box inverted. The draw pieces 7 and 8 are then removed through the bottom and ends of the box and the box lifted off the molded sand, carrylng with it the pattern pieces 5. When the core box is lifted from the mold sections the parts 16, 17 and 18 remain with the mold sections, and after the box has been removed they are withdrawn laterally from the mold sections. To revent each pair of complementary pieces and 8 from being shaken apart during jolting, in the end of each piece 8 is secured a dowel 19, and through each piece 7 passes a shaft 20, which extends out through the drawhead 10, as is best shown in Fig. 5. On the inner end of the shaft 20 is a locking pin 21, which is passed through a slot 22in the dowel 19. Then, when the shaft 20 is rotated, the pin 21 bears against the shoulder formed by the inner face of the dowel 19. At the outer end of the shaft 20 is a handle 23 and a locking member 24. 'Secured on the outer side of the drawhead 10 is a cam surface 25, as is shown in Fig. 7. As the shaft 20 is rotated so' as to look into the v piece 8 the member 24 rides up the cam 25 and thereby draws the piece 8 securely against the piece 7 and thus holds the parts 7 and 8 securely together and rigidly against 7 the drawhead 10. The inner end of the draw piece 7 is recessed, so that the tapered end of the dowel 19. fits snugly within it to hold the draw pieces 7 and 8 accurately in alinement. It is to be understood that I prefer to employ the construction just described in each compartment, but for simplification of the drawings I have shown it in connection with only one compartment in Figs. 1 and 2.

In Fig. 9 I have shown a completed quarter mold section which contains on one face thereof an incomplete half impression A for a preformed link, and within the body of the section two separate quarter link impressions B which extend within the impression A and intersect the plane thereof. Each mold section has at each end a part impression 12 of a stud of a link, each of which connects with an impression B, and also (except when used as a bottom mold section) a .part impression c for a pouring gate, each of which communicates respectively with an im ression B.

t will be seen that by use of the foregoing apparatus a plurality of mold sections can be made simultaneously, thereby increasing the speed at which the sections can be made, greatly increasing the output, and cheapening the manufacture of mold sections.

The terms and expressions which I have employed are intended to be used as terms of description and not of limitation, since I recognize that modifications of the features and constructions which I have described may be made within the scope of the invention claimed.

What I claim is:

1. A box for forming cast chain link molds, comprising a plurality of compartments, pattern pieces in each compartment to form part impressions for links within the body of the mold sections, and means for removing the pattern pieces simultaneously through guide ways in the ends and bottom of the box.

2. A box for forming cast chain link molds, pattern pieces to form part impressions for links within the body of the mold sections, means for removing the pattern pieces through guide ways in the sides and bottom of the box, and means for holding the pattern ieces for each part impression rigidly toget or during the molding operation.

3. A box for forming cast' chain link molds, comprising a plurality of compartments, pairs of complementary pattern pieces in each compartment, each pair to form part impressions for links within the body of the mold sections, guideways in the ends and bottom of the box and means for removing the pattern pieces simultaneously throu h said guideways.

4. E box for formlng cast chain link -molds, comprising a plurality of compartments, complementary pattern pieces in each compartment, each pair forming within the body of a mold section a quarter link impression, lever mechanism for oppositely' and simultaneously withdrawing the complementary pairs from within the box to permit the removal of the mold sections from the box.

5. A box for forming cast chain link molds, a pattern piece secured to the bottom of the box, and pattern pieces mounted in a plane at right angles to the plane of the first named pattern piece, and removable through the side and bottom of said box, and means for simultaneously removing said last named pattern pieces.

ALLEN T. DEXTER. 

